Just one example of what I like about systemd, and maybe you can call me new school, but I've really grown to like journald/journalctl.
Having systemd units automatically categorized and queryable has been very nice (the -u flag). The tag flag has also been great for me.
The --since and --until flags are godsends, I don't really care to waste time converting timestamps in my brain when all I want to do is do something like journalctl -u my_service --since yesterday --until today.
To me a way to centralize logs and have a tool like this to query them in a relatively advanced way is a major benefit.
I find that the complaints about systemd are mainly about UNIX philosphy and not about the actual functionality and benefits of those design choices. It seems like even mentioning that it's good brings back all these 2014 arguments about it.
You brought up mounting, the second paragraph of the systemd-mount manual quite clearly explains the benefit and what makes it different than the lower level mount command. And really it's not like systemd is ripping away your old tools especially in that particular case.